Hall effect printwheel encoder

Details Hall effect printwheel encoder Hall effect printwheel encoder

1987-12-21

1990-05-22

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With particular transmitter

34087030, 324664, 32420720, 32420722, 101 91, 101109, G08C 1906

Patent

active

049280899

ABSTRACT:
An encoder for a wheel comprises a linear Hall-effect sensor and magnet mounted on a non-ferrous metal shaft. A ferrous metal ring having a toothed structure extending inward such that each tooth ends at a point on a spiral curve is molded into the printwheel encircling the shaft. The Hall-effect sensor output provides a determined output when each tooth is positioned over the sensor to enable an absolute position determination while the signal drop off between the teeth as the wheel is moved allows for counting the steps between settings for relative encoding and redundancy.

REFERENCES:
patent: 4293837 (1981-10-01), Jaffe et al.
patent: 4706562 (1987-11-01), Hori
patent: 4719419 (1988-01-01), Dawley
patent: 4728950 (1988-03-01), Hendrickson et al.
patent: 4746859 (1988-05-01), Malik
patent: 4754220 (1988-06-01), Shimizu et al.

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